Well, indeed there were some horrific examples of so-called "Christians" in office...I can think of, for example...
...Warren Harding (Baptist)
...Stephen Grover Cleveland (Presbyterian)
But, to answer your challenge: Teddy Roosevelt in the early 1900s wasn't perfect by any means; but he embraced many standards...and fleshed many of them out well...Teddy R. was the first POTUS to invite a non-caucasian (Booker T. Washington) in to dine in the White House a half-century away from reformers like Martin Luther King...
(He was a Calvinist)
And Teddy Roosevelt was a class one progressive....geez...and you use inviting Washington to the WH as evidence of what???
I notice you didn’t mention the ever favorite Carter as an example of a horrific example (and yet should have)
You say that like it's a bad thing.
The pain you feel today is the strength you'll have tomorrow.